Semi-Electrical Conductivity of Gelcast Alumina Sintered under Nitrogen Atmosphere


Article Preview

This work demonstrated an in-situ pyrolysis of gelcast alumina under reduction sintering to make alumina and carbon composite in providing semi-electrical conductivity. To increase the carbon content, the monomer was varied in the premix solution with reduction sintering in nitrogen gas. Two-probe method was used to measure electrical resistance of the sintered samples. The results revealed that the increase of monomer addition and sintering treatment were effective in reducing electrical resistance. The lowest value was 3.6×106-cm, which is a potential candidate for electrostatic shielding application. The reduction-sintered sample was re-sintered in an air in order to gain insight on the conductive path due to carbon network. Further tests such as XRD, TGA/DTA, and scanning electron microscopywere used to explain the semi-conductive property of the material.



Advanced Materials Research (Volumes 11-12)

Main Theme:

Edited by:

Masayuki Nogami, Riguang Jin, Toshihiro Kasuga and Wantai Yang




R. L. Menchavez et al., "Semi-Electrical Conductivity of Gelcast Alumina Sintered under Nitrogen Atmosphere", Advanced Materials Research, Vols. 11-12, pp. 493-496, 2006

Online since:

February 2006




[1] S. Ghosal, A. Emami-Naeini, Y.P. Ham, B.S. Draskovich and J.P. Pollinger: J. Am. Ceram. Soc. Vol. 3 (1994), p.1352.

[2] M. Takahashi, K. Adachi, R. Menchavez and M. Fuji: J. Mater. Sci. (2005), accepted.

[3] J. Cordelair and P. Greil: J. Eur. Ceram. Soc. Vol. 20 (2000), p. (1947).

[4] M. Monthioux and O. Delverdier: J. Eur. Ceram. Soc. Vol. 16 (1996), p.721.

[5] H.K. Chen, C. Lin and C. Lee: J. Am. Ceram. Soc. Vol. 77 (1994), p.1753.

[6] H.K. Chen and C.I. Lin: J. Mat. Sci. Vol. 29 (1994), p.1352.

[7] Y. Yourdshahyan, C. Ruberto, M. Halvarsson, L. Bengtsson, V. Langer, B.I. Lundqvist, S. Ruppi and U. Rolander: J. Am. Ceram. Soc. Vol. 82 (1999), p.1365.

[8] P.S. Santos, H.S. Santos and S.P. Toledo: Mat. Res. Vol. 3 (1994), p.1352. a) b) Fig. 3. Microstructures of samples S1 sintered at 1550°C for 2 hours. a) sintered directly in nitrogen b) re-sintered in an air.